Importance

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Abstract

A probe comprising a tube made of solid electrolyte material is slidably mounted within a ceramic support tube which is mounted to project into the interior of a furnace. The end of the electrolyte tube is closed and the support tube has open ports or windows therein which expose the exterior end surface of the electrolyte tube to the hot furnace gases and causes a voltage to develop between the interior and the exterior surfaces of the electrolyte tube which is indicative of a furnace gas characterstic. A first electrode is supported between the ends of the electrolyte tube and the support tube, and a second electrode is supported within the inner end of the electrolyte tube. To prolong the life of the electrode, it is preferably made either of multiple layers of noble metal wire screens mounted in face-to-face relationship, a chemically stable electronic ceramic conductor such as cation-doped lanthanum chromite, or a noble metal screen coated with an electronic conducting ceramic cement.

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First Claim